题目内容
20．The passengers _______show their ID cards before getting on the plane．（ ）| A． | might | B． | must | C． | could |
分析 在登上飞机之前乘客必须出示他们的身份证．
解答 答案：B．
might可能；must一定；could可能；could和might都有表示猜测的意思．而且语气都比较委婉．但是could的肯定语气是大于might的．而且could 还带有一种"竟然，难以置信"的语气在里头．根据The passengers _______show their ID cards before getting on the plane，可知在登上飞机之前乘客必须出示他们的身份证．must一定，必须．故选B．
点评 本题考查了情态动词的用法．熟知句意以及所给选项的意思是解答本题关键．
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